I start to digitized my slide / print 20 years ago. I used syquest /iomega removable disk/ shutter disk / 3.5 and 5.25 inch MOl disk/ 8mm tape /DLT tape.
Removable disk is all gone, no longer in manufacturing for the drive or disk. 20mb/40mb/80mb/200mb for syquest. iomega to 4GB.
Shutter disk is using scsi / fast scsi bus, interface to computer is a problem no longer supported or need special hardware software to read.
MO disk the best, media very little problem and very reliable. However I think is very hard to find a drive in the market now. I have 40 of the cartridge. 128mb/230MB/640MB for 3.5inch. 250MB/550MB/1.2GB/2.3GB for 5.25 inch. Backward compatible is only 1 generation. a 1.2GB drive will not read 250MB cartridge. Same with most of all others device.
8mm tape not very reliable after more then 10 times of read re-write.
DLT is faster and better then 8mm. But then, 10GB/20GB/40GB/80GB xxxxxGB and when the new formate is out you better copy all to the new type, or you get stuck again.
My slide and print age between 15 to 35 years Colour print fade 20 to 60%, E6 process slide fade 20-80%, kodachrome fade 10% but at least I can visual, and still available. BW same as 35 years ago, just a bit yellowish.
all computer/digital storage is about 100% no problem. Because no hardware to verify.
CD is better then DVD is better then Re-writable CD. I have DVD cannot read by new drive.
I also have disc left in car, and after a hot sun bath, not readable. Just crash a hard disk last month and the disk is only 2 years old. Replace my D70 memory card reader because it give a error message to me and my card just bobo off.
So? Hee hee